6.1.2: Receptors Flashcards
(10 cards)
What does the Pacinian corpuscle respond to?
Pressure changes
What is the pacinian corpuscle made of?
Many layers of lamellae surrounding the sensory neurone
Hoe does the pacinian corpuscle work?
1) Increased pressure deforms stretch-mediated sodium channels
2) Sodium ion channel protein opens and sodium ions diffuse in
3) Depolarisation leads to generator potential
What colour does rods process in?
Black and white
What is retinal convergence in rods?
Many rods connect to one sensory neurone so can detect light at low light intensities
Why do rods have low visual acuity?
Several rod cells are connected to one neurone so light only generates one impulse so brain can’t distinguish between the separate light sources that generate them.
What colours do cones process in?
red, green and blue which absorb different wavelengths of light.
Why do cones have high visual acuity?
One cone cell connects to one bipolar cell so can only respond to high light intensity. The brain can distinguish between the separate sources of light.
Why are rods sensitive to all wavelengths of light?
Rhodopsin is light sensitive pigment
Why is each cone cell sensitive to a specific wavelength?
Each cone detects a specific wavelength of light (R-G-B) and there are three types of iodopsin.
